Projectile.



UNITED STATES PATENTPQFFICE.

ALYIS F. (ROOBL OF DALLAS, TEXAS.-

PROJ ECTlLE.

filPEGIEIOATION forming part of Letters Patent No. 677,179, dated June 25, 1901.

Application filed October 19, 1900. Serial No- 33,633. (No model.)

T!) r tZZ/ whom it may concern:

Be it known that I, ALv1s F. Cnoon, residing at Dallas, in the-county of Dallas and State of Texas, have made certain new and useful Improvements in Projectiles, of which the following: is a specification.

It is the object of my invention to provide an improved form ofprojectile for use in smooth-bore guns of any caliber, the same beto ing so grooved or rifled as to insure rapid ro- 2o depth from front to rear.

tation and great accuracy and range in flight. The construction I haveadopted is shown in the accompanying drawing, in which a side View of my projectile is represented.

The cylindrical body and conical point of the projectile are provided with two opposite spiral semicircular grooves f, extending to points adjacent to the rear end and having a uniform width and gradually diminishing in The width ofjthe grooves f is such; that each occupies. onefourth of the circumference of the projectile It will be seen that the cylindrical butt of the projectile havinga flat end dispenses with' the necessity for use of a sabot in smooth guns.

A projectile thus provided with grooves when fired from a smooth-bore firearm-will rotate once in every eight or ten inches of its flight and maintain a fiat trajectory'for a comparav3o tively long distance.

In other words, the pro- ,g'ectile will have the same rotary or spinning motion,and therefore the same accuracy,when

discharged from a smooth-bore gun as one from a gun having a rifle-bore, while the trajectory will be flatter and the. range greater, since a ball shot from a smooth bore encounters less friction and resistance, and therefore attains a greater velocity with a given pressure of explosive gases. The economy 0t time, labor, and expense in the manufacture of smooth-bore guns as compared with rifled ones also adds to the practicalimportance of a grooved projectile.

The projectile may be used in arified gun; but it would be desirable in such case to have a disk or sabot provided with radialprojections to fit the grooves.

What I claim is As an improved-article of manufacture, the projectile hereinbefore described, the same having a conical point and a cylindrical body which is of uniform diameter throughout its length, and provided with two semicircular spiral grooves arranged diametrically opposite, and extending from the apex to points "adjacent to the butt and gradually diminishing in depth toward the butt which is madecylindrical and fiat-at the end, as shown and described. I

. I Arms F. CROOM. Witnesses:

J. L. BURGESS,

O. W. VARDELL. 

